6. 仮想化技術 ハードウェアを抽象化し、複数のOSが動作で きるようにする Xen, VMware, QEMU, UML, KVM, OpenVZなど 古くは.. メインフレームの技術 Linux chroot, FreeBSD jail 7. 仮想化技術のメリット 可用性の向上 動作中の仮想マシンをほぼ瞬時に別ハードウェアに移動することがで きるため、ハードウェアのメンテナンスやアップグレードがサービスを停 止せずに行える。 柔軟性の向上 仮想マシン間でCPUやメモリなどの資源配分を指定することで、ニーズ に応じて適切な資源を無駄なく割り当て活用できる。 運用コストの低下 サーバ群において、他のサーバに環境を構築するのが容易である。 セキュリティの向上 仮想マシン環境は互いに隔離されており、ある仮想マシンで動作する 有害なソフトウェアがほかの環境や仮想マシンモニタに悪影響を与え ること
VT-d Posted Interrupts Feng Wu, Jun Nakajima <Speaker> Intel Corporation 2 Agenda • Motivation • Difference btw CPU-based and VT-d Posted Interrupts • Architecture • Implementation Details • Performance • Summary 3 • Interrupt virtualization efficiency • Interrupt migration complexity • Big requirement of host vector for different assigned devices Motivation 4 CPU-based Posted-Interrupt in Xen VCP
第3回関西IT系インフラ勉強会発表資料
What is paravirt_ops? paravirt_ops (pv-ops for short) is a piece of Linux kernel infrastructure to allow it to run paravirtualized on a hypervisor. It currently supports VMWare's VMI, Rusty's lguest, and most interestingly, Xen. The infrastructure allows you to compile a single kernel binary which will either boot native on bare hardware (or in hvm mode under Xen), or boot fully paravirtualized in
Needs Refactor Mixes Glossary, FAQ & HowTo elements Hyperthreading FAQ What is hyperthreading? Hyper-threading is the Intel technology name, and commonly known name, for the Computing concept known as simultaneous multithreading. AMD have an equivalent technology known as Cluster Multi-threading. Hyperthreading is a technology designed to improve the computational performance of superscalar proces
The blkback/blkfront drivers developed by the original Xen team was lightweight and fast zero-copy protocol that has served well for many years. However, as the number of physical cores and the number of guests have increased on systems, we have begun to identify some bottlenecks to scalability. This prompted a recent improvement to the protocol, called “persistent grants”. This blog post will des
This page contains answers to some common problems and questions about Xen. This list contains the most frequently asked questions. You may also want to check out the articles in Category:FAQ. Each section in this document links to further questions in other FAQ documents. General I'd like to contribute to the Xen Project wiki pages, I have something to add/edit/fix, how can I do it? Contributions
Xen is an open source hypervisor originally developed in the late 1990s as part of the XenoServers project. It was designed to enable efficient virtualization on non-virtualizable hardware through paravirtualization. While the core of Xen remains open source under the Xen.org project, many companies offer proprietary products based on Xen like Citrix's XenServer and Xen Cloud Platform. Xen uses a
PVH allows a paravirtualized Linux guest to run in ring 0 by using a hardware-assisted virtualization technique called PVH. PVH combines aspects of para-virtualization (PV) and hardware virtualization (HVM) by using a PV entry point to boot the guest faster while still allowing the guest kernel to run in ring 0. Performance benchmarks show that PVH provides significant performance improvements ove
システム環境 CPU: Intel Core-i7 860 チップセット: Intel P55 Express マザーボード: MSI P55M-SD40 Xen: 3.4.0 dom0: Oracle VM Server (Oracle Enterprise Linux 5.3ベース) Passthrough対象のdomU: OpenSolaris b134 PVHVM Xenは既にインストールされているという前提で始めます。/etc/grub.confのkernel行に「iommu=pv」と追記してI/O Virtualizationを有効化します。＊これはBIOSでの有効とは異なります。BIOSでI/O Virtualizationを有効にした上でこの設定を行います。参考までにgrub.conf全体を。 default=0 timeout=5 splashimage=(hd0,0)/
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